Slide positioning mechanism for projectors



May 2, 1950 F. J. PERILLO 2,505,170

SLIDE POSITIONING MECHANISM FOR PROJECTORS Original Filed July 10, 1946 4 2 Sheets-Sheet 1 Z6 40 a; 4 a 26 5/ 42 i! I .99 4/6 0 g .56

50 H 6 49 fiiifl 46 "VB/1 a!" m 11 PM WWW! [$4 y 1950 F. J. PERILLO 2,506,170

SLIDE POSITIONING MECHANISM FOR PROJECTORS Original Filed July 10, 1946 2 Sheets-Sheet 2 Aftor'msy r i atented May 2 1950 v SLIDE-POSITIONING. MECHANISM FOR PROJ-EGTO-RS-J o1rim ti a pliqe ion: J a101,; 246; Serial 68%,fi33, D-iyicle t and this applieati oiifseptm-j ter 1o,1947 ser1s No.-773',292-

7 "Clttims. (Cl. 188-5928):

invention" relates-t6 apparatus-"for "pro jee'tiiig.transparencies ona-screenin emal rgeq farm; Morepartieularlyit relates to slide'prm jetiofi eppar'atuswhich "is light, portable; selfcontained and folds compactly into a carrying case l'r id which is capable of *being quickly -set uij of'the projection 'orima'gesand gs iquickly repaekjd'tor tr nsport."

"This "ap lication-is"a-u visio of myeo-pend aind is di'i'eeted particularly to'the means therein" 1' sedfiorpositioning the transparent slides be eerjif'th'e'"llliirnin"sting system and 1711i? lens of the projector. other 'subjfectmetter disclosed but notiola'imed herein is claimed in myeo -pe z 1d mg a pplieation serz-Ne. 30,253; filedfiune 1948,

Withthe rspid developmerit and popularity for stilliohoftogr'aphy'on' 35 min film; Whichhestaken placei'nrecentyears; there is now widespread use oiffgfll'ii'i slides and filinstrips for projectionpur-r" poses? Positive tratnspareiici'es" are ade-- mm- 3fr mm negatives *or by revel-sail processes endut'ili'z'ed in "the form of film "strips 7 containing, ieturesin either -s;ing1e-irame 'or double-"- (if such positivetran'spareneies ere "singly mounted "in suitable holders which are generally- 2 "inches square and inserted indivifliiallyfixito orojiietiop' apparatus -forjprmiueirig-en1 gect season a screed? s'ueh' intiiinc'loaflly'mouriteiltreiisoereiroies are referred to as film sli des v i The pictorial method of presenting makes filrn'*'s1i'd,e projectors-useful 'iiimany sitetr-ttis education';"*voeationa1"training, selling:

grid-amusement? They-rosy be seed fer-teem:

mfg-iii sehoo'ls, industrialtraining; sales story presfitati'on angiirr other obvious -ways: Thesemany possible uses 'make desira ble highly adapt? albleifioictidn apparatus-Which eel-f1 be'used not orgy-for -the projec'tionbf highly emesme:-

tureson screens-*in' darkened 'room'sbut also for projectior of smaller pictures; for example 8 x12 inches? with "illumination sufliciently' bright- "for use n I The utility of prQjeGtin'app3lia tuS' which is eerie ol e tel'y self-contefined and which canoe rapidly set Without disturbing the errangemerit'ot-= a reoiii in adwelling-or oiile, to show projected part'satthehirige'iao' e (e) To provide features of collepsib'ility-" of various elements I enhance ortability we economy'of-space;

"(dy To provide foldingslide =guiding-= means; quickly movable -m-teand eut of operative osi tiohj'a-nd" i (e) To provide simple and'effectiveeooperet ing means -for liol'dih'g *fiiih slides, introduced-' throng-h saiot' guiding- Y means, in the proper plane for projeotion;

Qther obj-eets and- 1 advantages *will" become apparent in $118 course -of the following detaileddesorigtien oith presentpreferred embd-imefit of the invention; taken iii-conjunotionwith the drawings, mwm-cm V 3 e2 1" Ii's -a perspective view-of: a complete pro je'cti'on': 'outfit set up for use- With a, short ideal length i lens to prdject -a' picture substantially filling-the Viewimtsreen:

Fig v :2 :is a top iplagniview of one :ha;1f---of the earrymgeeseshowing-the projector in folded: position; I

Fig; 3' is a. front elevation of the projector and: its support, in erected position ready for use with" the sl ide'guidesexteiided';

Fig. lis ed -rear el evation o'f :the' front portion off the projector-support" With a fragmentary: seetionof. the projector housingshowndmfdldeda ositiom-takexi on thez liile-fl kef Fig. 2. I

Fig 5 is a ziiergzmentmc yperspective otithe "front: ofithe projector housingn'wiith the. lens mount moved showingone sli'de guidezin operative post-e tion and the other" onel-lfolded.;ir

:Eigi '6 :is ee peuspetiveaof th'e zle'nshmountsfietaehed from. the housing and: viewed from ithe: left lre'an o ne slide pressure bar and :itsn spring-c being shbwnrmr elar'itiy 'as. removed fromlithein normal; assembled iposition's';

Figs-'7 i se :fi ag'inente-Jry horizontak sectiiim through the junetion of housingand leii s mount taken-"on the line 3-4 of mg; 2, andushowing the cooperative relationship :J-betweenn-the 'zslidw guiding and slide holding means ;L- and Fig. 8 is a. top plan view- 0f the projectorwim the cover i'emovedfthe condenser lens cari iers beine shown inzzbroken 'linesth'etslide guides'being' f in extended-position- Figs 1 shows e eomple'te pm; eotio'n apparatus embodying the iriverition whioh comprises :a twopart carrying ease-:having a lower half flo anfl upperhalfzil toig-e'theralong oneredge by separable hingesiiig- The depth otltheitwo ease is equal and the abutting siiie' eii ges jof= the *two' @356 parts are preferably slping as snown,- so that-the i10W61"h a;1f- 20 is ee er. Seeured to the largest side of the lowei' half-=isfl aprojector supportirig mmb'er 2i having-f 1 twoupstahdfiiebraeKets-QS and-Q6: A projeetoia which extends diagonally downward from front to rear throughout the major portion 'of the length of the housing, as indicated at 35, the line of division being horizontal at the front 36 and back 38.

Referring particularly to Figs. 3 and 4, the housing 32 is pivotally mounted on the brackets 25 and 26 through brackets 39, 46 which are attached as by screws M to the underside of the housing body 32. The brackets 26 and 46 at the front end are fastened together by means of a shouldered screw 42 and a nut 43. The portions of the brackets 26 and 46 surrounding the screw 42 are preferably dished, as shown at 44, so as to form substantial bearing or pivoting surfaces independent of the screw. The brackets 25 and 39 are fastened together in a like manner. The point of attachment of the brackets 39 and 46 to the brackets 25 and 26 is a substantial distance above the bottom of member 24, and the pivot points of the brackets 39 and 46 are offset from the center of housing 32 toward one side thereof, so that when the projector is turned on its side, as shown in Figs. 2 and 3, it lies flat against the bottom of the case and when erected into the position shown in Fig. 3, it is elevated sufficiently so that the axis of its lens is approximately opposite the center of screen 29.

Looking means are provided, for maintaining the projector in its folded or upright position, including a flat arcuate bar 46, the curve of which has the center of screw 42 as its center. This bar is pivotally attached to the inside front portion of the body 32 of the housing, as shown at 48 in Fig. 4 and slides through a cleat 49 secured to the bracket 26 on its inner side. Pivotally mounted at 49 on the outer face of bracket 26 is a lever 50 having a thumb piece 5! and a catch 52, the latter extending through an opening 54 in bracket 26. Under the edge of bar 46 aispring 55 urges the catch 52 upward toward the bar 46 and the latter is provided with two notches 56 and 56 which engage the catch 52 to hold the projector in either position. A lug 41' punched out at right angles from bracket 46 engages the top edge of bracket 26 when the projector is upright and acts as a stop, making the structure more rigid.

Referring particularly to Figs. 5, 6 and 7, the front end of the housing 32 is provided with an aperture 6| through which the light passes to the film slide, this aperture being surrounded by a flat, smooth surface 62. The face of the housing 32 is indented at either side of the aperture 6|, as shown at 64, so that a single film slide may be pushed into centered position with respect to the aperture, the indentation 64 providing space for the users finger or thumb. A lens mount 65, which is also preferably a die casting, is provided which has on its rear surface an upper spacing block 66 and a lower spacing block 68 having tapped holes 69 to receive screws. Corre- 4 sponding clearance holes 16 are provided at the top and bottom of the flat portion 62 of the housing 32. The lens mount may be centered on the front of the housing by means of locating pins ll set in the housing which enter holes 12 in the lens mount, which is then secured in place by screws passing through the holes 16 and into the holes 69. When the lens mount is in position on the housing there is a space between it and the housing defined at the top by the block 66 and at the bottom by a flat ledge 12, which may, if desired, be continuous with the lower block 66. Through this space the film slides or other form of transparencies are introduced in front of the light coming through the aperture 6|. The front end of the lens mount may be constructed in any manner desired so as to adjustably receive various types Of lenses which may either be inserted in the aperture in the front of the mount or coupled to the outside thereof by means of bayonet slots cooperating with pins.

The means for guiding film slides into position in front of the aperture 6E and in line with the lens axis and holding them there during projection consist of folding slide guides and cooperating spring-actuated pressure bars which will now be described. The folding slide guides.

consist of right and left-hand members, best shown in Fig. 5, which may be formed of sheet metal bent into the shape illustrated and having U-shaped channel portions 76 integral with,

bifurcated end portions 'il perforated to slip over pins 18. When the lens mount is in position,

pins 16 and portions 77 are beneath the ledge 12.

of the lens mount on either side of block 68 and the bottoms of channel portions 16 are in alinement with the upper surface of ledge 12 when the slide guides are raised as shown in Fig.-

3. The pins 18 are set into the face of the housing 12 and are of such length that their outer ends are in contact with the face 79 of mount 65. Pivotally attached to each slide guide at 80 are slotted links 8! which operate over fixed headed pins 82 fastened to the housing 32. A spring 84 with two downwardly extending leaves perpendicular to the face of housing 32 pushes the links against the pins so that the offset ends of the slots in the links lock the links in the extended position shown in Fig. 3. The spring 84 has a bridge portion 85 attached to the housing by rivets or the like. It will be apparent that by pressing links 8| toward spring 84 the slide guides may be released and lowered into the vertical position shown at the left in Fig. 5. As shown in Fig. 7, with the slide guides in their operative or horizontal position, they will support a slide 86 as it is introduced into or ejected from the projection position before the aperture 6|.

When the slide is in projection position, it is held fiat against the surface 62 of the housing so as to be in the focal plane of the lens. This is accomplished by means of a pair of upper and lower pressure bars 88 which are of the shape best shown at the lower part of Fig. 6. Their ends are first bent at an obtuse angle to their principal surface and again bent to terminate in tongues 89 which closely surround a portion of the lens mount and prevent lateral movement of the bars. On one edge of each bar 88 are two tongues 96 which enter apertures 9| formed in the lens mount. These apertures are suificiently deep so that the bar may move away from the face 62 of the housing to permit the passage of a slide and they serve to prevent vertical movement of the pressure bars. Coil springs 92, seated in recesses 94 in the lens mount, bear against the centers of the bars and urge them toward the face 62 of housing 32 to engage the slides at top and bottom. As shown in Fig. '7, on being introduced into the projector, the slide 86, resting in the channel i6, first engages the angular faces 95 on the corresponding ends of upper and lower bars 88 and forces them away from the face 62 of the housing against the pressure of springs 92. Since the bars 88 are symmetrical at their ends, Slides may be introduced. from either side. If desired, two springs may be used with each of the bars $3, spaced inwardly from their ends but a single central spring has been found sunficient.

Where one slide is in position for projection, in front of aperture 6!, it is shoved out of this position and received in one of the guides 15 upon insertion of another slide, the edges of the two slides being brought into abutting relation by the combined guiding action, upon'the slide being inserted, of the guide 76, the flat face (52 of housing 32 and the angular faces 95 of the bars 88.

Referring to Fig. 8, a top plan view of the complete projector is shown with the top cover 3 3 removed to show the relationship of the several parts which are described in more detail in my aforesaid application Ser. No. 682,633. Briefly, housing 32 is provided inside its bottom with parallel horizontal rails or ribs 99 which support an upstanding lamp house with a back I62 carrying a reflector Hi9, and a chimney H2 in which are light baflles H4. Current is supplied to the lamp through wires H8 and switch 120. In the deep front part of housing 32 are vertical guideways or slots 25 for slides I25 which carry condenser lens elements A, B and B which are arranged to concentrate the light on the slides inserted behind lens I28 in the plane of the guides 16.

It will be noted particularly that the invention provides an extremely simple, effective and rugged slide guiding and holding mechanism which efi'ectively guides and supports one slide on either side of the slide which is in position for projection, yet without any parts which have to be removed from the projector when it is packed for carrying. The guides 'Ifiwhen folded are entirely within the confines of the projector sides and it can lie absolutely fiat on its side. The guides can be instantly moved into operating position and automatically locked there.

It is to be understood that the invention is not limited to the structural details of the illustrative embodiment above described, since many obvious modifications may be made therein without departin from the spirit of the invention as defined in the claims.

What is claimed is:

1. In a projector having a lamp housing and lens mount between which is a passage having a horizontal bottom adapted to receive a slide, slide guiding and positioning means comprising a pivotally mounted channel member adapted to be swung into and out of alinement with said bottom, means for supporting said member in alined position, a pressure bar extending horizontally through said passage adapted to hold said slide against one of the faces thereof, said bar having an end extending angularly across said channel adapted to be engaged by a slide moved therethrough whereby movement of the slide into said passage displaces said bar, and resilient means acting upon said bar to urge it toward one side of said passage.

2. Slide guiding and positioning means as defined in claim 1 wherein one of said channel members is provided on each side of said passage and said pressure bar extends angularly at each end across each of said channels whereby slides may be introduced into said passage from either side.

3. Slide guiding and positioning means as defined in claim 1 wherein one of said pressure bars is provided at the top and another at the bottom of said passage for simultaneously engaging the top and bottom of a slide positioned therein.

4. In a projector having a slide passage between the lamp housing and lens mount, slide guiding means for directing slides into and out of said passage comprising a pair of pivotally mounted guide members, means for pivotally supporting said members at their inner ends adjacent said passage, links pivoted to said members to support them in raised position, fixed stops on said housing, said links being slidably connected with said stops, said links having notches adapted to engage said stops when said members are in raised positions, and resilient means urging said notches into locking relation with said stops.

5. The guiding means defined in claim 4 in which said guide members are in the form of channels throughout most of that portion which extends outwardly from said slide passage, the bottoms of said channels being in alinement with the bottom of said passage when said members are in raised position.

6. The guiding means defined in claim 4 in which said guide members have their pivotal points beneath said slide passage, form a continuous straight support together with the bottom of the passage when in raised position, and when lowered extend downwardly within the limits of the sides of the housing or projections of those s1 es.

'7. In a slide projector casing provided with a passage to receive a slide, means for urging the slide into contact with a face of said passage comprising, a pressure bar extending through said passage, the ends of said bar extending angularly away from said face to engage said slide at an angle as it is introduced into said passage, a spring extending into said passage and positioned to press against the center of said bar, means for supporting said spring, said casing having a pair of recesses adjacent said bar and spaced on either side of its center, said bar being provided with tongues bent at right angles to the surface of said bar and extending into said recesses to maintain the bar in position in an endwise direction while permitting it to move at either end away from the face of said passage toward which it is urged by said spring when a slide is inserted between said face and said bar.

FLORINDO J. PERILLO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,298,413 Reid Oct. 13, 1942 FOREIGN PATENTS Number Country Date 22,151 Great Britain of 1892 

